The documentation page for the padding property of Layout. Webix Docs

defines the space between the element borders and content (applies the specified value to all sides).

number|object padding;

Example

webix.ui({
    view:"toolbar",
    padding:10,
    cols:[
        { view:"button", value:"Load" },
        { view:"button", value:"Save" },
        { view:"button", value:"Delete" }
    ]
});

Details

The image below shows how the script above applies the padding property.

If set as a number, the padding is the same for all four sides. Additionally, you can use paddingX and paddingY to set the same paddings for top-bottom and left-right sides.

If you want to set different paddings for all sides, set padding for one side or for e.g. top and left sides, you can define padding as an object:

webix.ui({
    view:"layout",
    padding:{
      top:5, bottom:7, left:10, right:8
    },
    rows:[
        { view:"toolbar", elements:[ { view:"icon", icon:"wxi-drag" }, {} ] },
        { template:"Main view" }
    ]
});